grub2 UEFI PXE loads kernel/initrd very very slowly.

[David Monro]

If I use the grub-mknetdir command with grub-efi-amd64 v 2.02~beta2-29 as follows:

grub-mknetdir -d /usr/lib/grub/x86_64-efi --net-directory=/var/lib/tftpboot --subdir=grub2-efi

to generate a PXE environment, and then boot a UEFI VM (or physical box) using this PXE environment, loading the kernel and initrd via TFTP takes a very long time (several minutes). This is due to a bug where grub2 doesn't open the protocol stack in exclusive mode and therefore doesn't actually end up receiving all the TFTP packets.

I have rebuilt the grub package with the attached patch (from fedora) and this completely fixes the problem, and the kernel and initrd take only a few seconds to load.

Cheers

David

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Patch from fedora which fixes the problem" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.